How to diagnose and fix git fatal: unable to read tree

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Following my older recommendation, it boils down to being able to find a repo which actually contains the missing elements (here full trees).
This is what is shown in “How to fix corrupted git repository?“.

But if a full clone doesn’t solve the problem, then it may be:

Update July 2016, with Git 2.10 soon to be release, you now have:

git fsck --name-objects

See “How to fix git error broken link from tree to tree?” for more.

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